| 摘要 |
A depth adjuster made of injection molded plastic parts has a bit housing which screws onto the projecting externally threaded nose on the gear housing of a standard electric powered hand tool provided with a positive pressure engaged clutch. The bit housing has a bore to accommodate the clutch chuck and the shank of a bit for a screw head. The bore passes through an extending neck on the bit housing which is externally threaded and provided with an outwardly facing shoulder having locking tabs. Onto this neck is threaded a locator assembly of a type designed for a particular application. This assembly has three parts which are snapped into place and remain assembled even when disconnected from the bit housing. These parts consist of (1) a locking collar with locking slots which engage with the locking tabs, (2) a locator sleeve which has limited axial movement and a non-rotative movement with respect to the locking collar, and (3) a compression spring which axially urges the locking collar rearwardly toward the outer extreme of its limited motion with respect to the locator sleeve. |
